pkg/analyzer/tool/messages/generate.dart - sdk - Git at Google

 // Copyright (c) 2021, the Dart project authors. Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.

 /// This file contains code to generate scanner and parser message
 /// based on the information in pkg/front_end/messages.yaml.
 ///
 /// For each message in messages.yaml that contains an 'index:' field,
 /// this tool generates an error with the name specified by the 'analyzerCode:'
 /// field and an entry in the fastaAnalyzerErrorList for that generated error.
 /// The text in the 'analyzerCode:' field must contain the name of the class
 /// containing the error and the name of the error separated by a `.`
 /// (e.g. ParserErrorCode.EQUALITY_CANNOT_BE_EQUALITY_OPERAND).
 ///
 /// It is expected that 'pkg/front_end/tool/fasta generate-messages'
 /// has already been successfully run.
 library;

 import 'dart:convert';
 import 'dart:io';

 import 'package:analyzer/src/utilities/extensions/string.dart';
 import 'package:analyzer_testing/package_root.dart' as pkg_root;
 import 'package:analyzer_utilities/tools.dart';
 import 'package:collection/collection.dart';
 import 'package:path/path.dart';

 import 'error_code_info.dart';

 Future<void> main() async {
   await GeneratedContent.generateAll(pkg_root.packageRoot, allTargets);

   _SyntacticErrorGenerator()
     ..checkForManualChanges()
     ..printSummary();
 }

 /// A list of all targets generated by this code generator.
 final List<GeneratedContent> allTargets = _analyzerGeneratedFiles();

 /// Generates a list of [GeneratedContent] objects describing all the analyzer
 /// files that need to be generated.
 List<GeneratedContent> _analyzerGeneratedFiles() {
   var classesByFile = <GeneratedErrorCodeFile, List<ErrorClassInfo>>{};
   for (var errorClassInfo in errorClasses) {
     (classesByFile[errorClassInfo.file] ??= []).add(errorClassInfo);
   }
   var generatedCodes = <(String, String)>[];
   return [
     for (var entry in classesByFile.entries)
       GeneratedFile(entry.key.path, (pkgRoot) async {
         var codeGenerator = _AnalyzerErrorGenerator(
           entry.key,
           entry.value,
           generatedCodes,
         );
         codeGenerator.generate();
         return codeGenerator.out.toString();
       }),
     GeneratedFile('analyzer/lib/src/diagnostic/diagnostic_code_values.g.dart', (
       pkgRoot,
     ) async {
       var codeGenerator = _DiagnosticCodeValuesGenerator(generatedCodes);
       codeGenerator.generate();
       return codeGenerator.out.toString();
     }),
   ];
 }

 /// Code generator for analyzer error classes.
 class _AnalyzerErrorGenerator {
   final GeneratedErrorCodeFile file;

   final List<ErrorClassInfo> errorClasses;

   final List<(String, String)> generatedCodes;

   final StringBuffer out = StringBuffer('''
 // Copyright (c) 2021, the Dart project authors. Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.

 // THIS FILE IS GENERATED. DO NOT EDIT.
 //
 // Instead modify 'pkg/analyzer/messages.yaml' and run
 // 'dart run pkg/analyzer/tool/messages/generate.dart' to update.

 // While transitioning `HintCodes` to `WarningCodes`, we refer to deprecated
 // codes here.
 ''');

   _AnalyzerErrorGenerator(this.file, this.errorClasses, this.generatedCodes);

   void generate() {
     out.writeln('// ignore_for_file: deprecated_member_use_from_same_package');
     if (file.shouldIgnorePreferSingleQuotes) {
       out.writeln('// ignore_for_file: prefer_single_quotes');
     }
     out.write('''
 //
 // Generated comments don't quite align with flutter style.
 // ignore_for_file: flutter_style_todos
 ''');
     out.writeln();
     out.write('''
 part of ${json.encode(file.parentLibrary)};
 ''');
     bool shouldGenerateFastaAnalyzerErrorCodes = false;
     for (var errorClass in errorClasses) {
       if (errorClass.includeCfeMessages) {
         shouldGenerateFastaAnalyzerErrorCodes = true;
       }
     }
     if (shouldGenerateFastaAnalyzerErrorCodes) {
       out.writeln();
       _generateFastaAnalyzerErrorCodeList();
     }
     for (var errorClass
         in errorClasses.toList()..sort((a, b) => a.name.compareTo(b.name))) {
       out.writeln();
       if (errorClass.comment.isNotEmpty) {
         errorClass.comment.trimRight().split('\n').forEach((line) {
           out.writeln('/// $line');
         });
       }
       out.write(
         'class ${errorClass.name} extends DiagnosticCodeWithExpectedTypes {',
       );
       var memberAccumulator = MemberAccumulator();
       var entries = [
         ...analyzerMessages[errorClass.name]!.entries,
         if (errorClass.includeCfeMessages)
           ...cfeToAnalyzerErrorCodeTables.analyzerCodeToInfo.entries,
       ].where((error) => !error.value.isRemoved);
       for (var entry in entries) {
         var errorName = entry.key;
         var errorCodeInfo = entry.value;

         try {
           if (errorCodeInfo is! AliasErrorCodeInfo &&
               errorClass.includeInDiagnosticCodeValues) {
             generatedCodes.add((errorClass.name, errorName));
           }
           errorCodeInfo.toAnalyzerCode(
             errorClass,
             errorName,
             memberAccumulator: memberAccumulator,
           );
         } catch (e, st) {
           Error.throwWithStackTrace(
             'While processing ${errorClass.name}.$errorName: $e',
             st,
           );
         }
       }

       var constructor = StringBuffer();
       constructor.writeln(
         '/// Initialize a newly created error code to have the given '
         '[name].',
       );
       constructor.writeln(
         'const ${errorClass.name}(String name, String problemMessage, {',
       );
       constructor.writeln('super.correctionMessage,');
       constructor.writeln('super.hasPublishedDocs = false,');
       constructor.writeln('super.isUnresolvedIdentifier = false,');
       constructor.writeln('String? uniqueName,');
       constructor.writeln('required super.expectedTypes,');
       constructor.writeln('}) : super(');
       constructor.writeln('name: name,');
       constructor.writeln('problemMessage: problemMessage,');
       constructor.writeln(
         "uniqueName: '${errorClass.name}.\${uniqueName ?? name}',",
       );
       constructor.writeln(');');
       memberAccumulator.constructors[''] = constructor.toString();

       memberAccumulator.accessors['severity'] = '''
 @override
 DiagnosticSeverity get severity => ${errorClass.severityCode};
 ''';
       memberAccumulator.accessors['type'] = '''
 @override
 DiagnosticType get type => ${errorClass.typeCode};
 ''';

       memberAccumulator.writeTo(out);
       out.writeln('}');

       if (literateApiEnabled) {
         out.writeln();
         _outputDerivedClass(errorClass, withArguments: true);
         out.writeln();
         _outputDerivedClass(errorClass, withArguments: false);
       }
     }
   }

   void _generateFastaAnalyzerErrorCodeList() {
     out.writeln('final fastaAnalyzerErrorCodes = <DiagnosticCode?>[');
     for (var entry in cfeToAnalyzerErrorCodeTables.indexToInfo) {
       var name =
           cfeToAnalyzerErrorCodeTables.infoToAnalyzerCode[entry]?.toCamelCase();
       out.writeln('${name == null ? 'null' : 'ParserErrorCode.$name'},');
     }
     out.writeln('];');
   }

   void _outputDerivedClass(
     ErrorClassInfo errorClass, {
     required bool withArguments,
   }) {
     var className =
         withArguments
             ? errorClass.templateName
             : errorClass.withoutArgumentsName;
     out.writeln('final class $className');
     if (withArguments) out.writeln('<T extends Function>');
     out.writeln('    extends ${errorClass.name}');
     if (!withArguments) out.writeln('    with DiagnosticWithoutArguments');
     out.writeln('{');
     if (withArguments) {
       out.writeln('final T withArguments;');
       out.writeln();
     }
     out.writeln(
       '/// Initialize a newly created error code to have the given '
       '[name].',
     );
     out.writeln('const $className(');
     out.writeln('super.name,');
     out.writeln('super.problemMessage, {');
     out.writeln('super.correctionMessage,');
     out.writeln('super.hasPublishedDocs = false,');
     out.writeln('super.isUnresolvedIdentifier = false,');
     out.writeln('super.uniqueName,');
     out.writeln('required super.expectedTypes,');
     if (withArguments) out.writeln('required this.withArguments,');
     out.writeln('});');
     out.writeln('}');
   }
 }

 class _DiagnosticCodeValuesGenerator {
   final List<(String, String)> generatedCodes;

   final StringBuffer out = StringBuffer('''
 // Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.

 // THIS FILE IS GENERATED. DO NOT EDIT.
 //
 // Instead modify 'pkg/analyzer/messages.yaml' and run
 // 'dart run pkg/analyzer/tool/messages/generate.dart' to update.

 // We allow some snake_case and SCREAMING_SNAKE_CASE identifiers in generated
 // code, as they match names declared in the source configuration files.
 // ignore_for_file: constant_identifier_names

 // While transitioning `HintCodes` to `WarningCodes`, we refer to deprecated
 // codes here.
 // ignore_for_file: deprecated_member_use_from_same_package
 ''');

   _DiagnosticCodeValuesGenerator(this.generatedCodes);

   void generate() {
     generatedCodes.sortBy((x) => '${x.$1}.${x.$2}');

     out.writeln();
     out.writeln(r'''
 import 'package:_fe_analyzer_shared/src/base/analyzer_public_api.dart';
 import 'package:_fe_analyzer_shared/src/base/errors.dart';
 import 'package:analyzer/src/dart/error/ffi_code.dart';
 import 'package:analyzer/src/dart/error/syntactic_errors.dart';
 import 'package:analyzer/src/error/codes.dart';
 import 'package:analyzer/src/manifest/manifest_warning_code.dart';
 import 'package:analyzer/src/pubspec/pubspec_warning_code.dart';
 ''');
     out.writeln();
     out.writeln(
       "@AnalyzerPublicApi(message: 'exported by lib/error/error.dart')",
     );
     out.writeln('const List<DiagnosticCode> diagnosticCodeValues = [');
     for (var (className, errorName) in generatedCodes) {
       errorName = errorName.toCamelCase();
       out.writeln('  $className.$errorName,');
     }
     out.writeln('];');
     out.writeln();
     out.writeln(
       "@AnalyzerPublicApi(message: 'exported by lib/error/error.dart')",
     );
     out.writeln('@Deprecated("Use \'diagnosticCodeValues\' instead")');
     out.writeln(
       'List<DiagnosticCode> get errorCodeValues => diagnosticCodeValues;',
     );
   }
 }

 class _SyntacticErrorGenerator {
   final String errorConverterSource;
   final String parserSource;

   factory _SyntacticErrorGenerator() {
     String frontEndSharedPkgPath = normalize(
       join(pkg_root.packageRoot, '_fe_analyzer_shared'),
     );

     String errorConverterSource =
         File(
           join(
             analyzerPkgPath,
             joinAll(posix.split('lib/src/fasta/error_converter.dart')),
           ),
         ).readAsStringSync();
     String parserSource =
         File(
           join(
             frontEndSharedPkgPath,
             joinAll(posix.split('lib/src/parser/parser.dart')),
           ),
         ).readAsStringSync();

     return _SyntacticErrorGenerator._(errorConverterSource, parserSource);
   }

   _SyntacticErrorGenerator._(this.errorConverterSource, this.parserSource);

   void checkForManualChanges() {
     // Check for ParserErrorCodes that could be removed from
     // error_converter.dart now that those ParserErrorCodes are auto generated.
     int converterCount = 0;
     for (var errorCode
         in cfeToAnalyzerErrorCodeTables.infoToAnalyzerCode.values) {
       if (errorConverterSource.contains('"$errorCode"')) {
         if (converterCount == 0) {
           print('');
           print(
             'The following ParserErrorCodes could be removed'
             ' from error_converter.dart:',
           );
         }
         print('  $errorCode');
         ++converterCount;
       }
     }
     if (converterCount > 3) {
       print('  $converterCount total');
     }

     // Fail if there are manual changes to be made, but do so
     // in a fire and forget manner so that the files are still generated.
     if (converterCount > 0) {
       print('');
       throw 'Error: missing manual code changes';
     }
   }

   void printSummary() {
     // Build a map of error message to ParserErrorCode
     var messageToName = <String, String>{};
     for (var entry in analyzerMessages['ParserErrorCode']!.entries) {
       String message = entry.value.problemMessage.replaceAll(
         placeholderPattern,
         '',
       );
       messageToName[message] = entry.key;
     }

     String messageFromEntryTemplate(ErrorCodeInfo entry) {
       String problemMessage = entry.problemMessage;
       String message = problemMessage.replaceAll(RegExp(r'#\w+'), '');
       return message;
     }

     // Remove entries that have already been translated
     for (ErrorCodeInfo entry
         in cfeToAnalyzerErrorCodeTables.infoToAnalyzerCode.keys) {
       messageToName.remove(messageFromEntryTemplate(entry));
     }

     // Print the # of autogenerated ParserErrorCodes.
     print(
       '${messageToName.length} of '
       '${cfeToAnalyzerErrorCodeTables.infoToAnalyzerCode.length} ParserErrorCodes generated.',
     );

     // List the ParserErrorCodes that could easily be auto generated
     // but have not been already.
     var analyzerToFasta = <String, List<String>>{};
     frontEndMessages.forEach((fastaName, entry) {
       var analyzerName = messageToName[messageFromEntryTemplate(entry)];
       if (analyzerName != null) {
         analyzerToFasta
             .putIfAbsent(analyzerName, () => <String>[])
             .add(fastaName);
       }
     });
     if (analyzerToFasta.isNotEmpty) {
       print('');
       print('The following ParserErrorCodes could be auto generated:');
       for (String analyzerName in analyzerToFasta.keys.toList()..sort()) {
         List<String> fastaNames = analyzerToFasta[analyzerName]!;
         if (fastaNames.length == 1) {
           print('  $analyzerName = ${fastaNames.first}');
         } else {
           print('  $analyzerName = $fastaNames');
         }
       }
       if (analyzerToFasta.length > 3) {
         print('  ${analyzerToFasta.length} total');
       }
     }
   }
 }
	// Copyright (c) 2021, the Dart project authors. Please see the AUTHORS file
	// for details. All rights reserved. Use of this source code is governed by a
	// BSD-style license that can be found in the LICENSE file.

	/// This file contains code to generate scanner and parser message
	/// based on the information in pkg/front_end/messages.yaml.
	///
	/// For each message in messages.yaml that contains an 'index:' field,
	/// this tool generates an error with the name specified by the 'analyzerCode:'
	/// field and an entry in the fastaAnalyzerErrorList for that generated error.
	/// The text in the 'analyzerCode:' field must contain the name of the class
	/// containing the error and the name of the error separated by a `.`
	/// (e.g. ParserErrorCode.EQUALITY_CANNOT_BE_EQUALITY_OPERAND).
	///
	/// It is expected that 'pkg/front_end/tool/fasta generate-messages'
	/// has already been successfully run.
	library;

	import 'dart:convert';
	import 'dart:io';

	import 'package:analyzer/src/utilities/extensions/string.dart';
	import 'package:analyzer_testing/package_root.dart' as pkg_root;
	import 'package:analyzer_utilities/tools.dart';
	import 'package:collection/collection.dart';
	import 'package:path/path.dart';

	import 'error_code_info.dart';

	Future<void> main() async {
	await GeneratedContent.generateAll(pkg_root.packageRoot, allTargets);

	_SyntacticErrorGenerator()
	..checkForManualChanges()
	..printSummary();
	}

	/// A list of all targets generated by this code generator.
	final List<GeneratedContent> allTargets = _analyzerGeneratedFiles();

	/// Generates a list of [GeneratedContent] objects describing all the analyzer
	/// files that need to be generated.
	List<GeneratedContent> _analyzerGeneratedFiles() {
	var classesByFile = <GeneratedErrorCodeFile, List<ErrorClassInfo>>{};
	for (var errorClassInfo in errorClasses) {
	(classesByFile[errorClassInfo.file] ??= []).add(errorClassInfo);
	}
	var generatedCodes = <(String, String)>[];
	return [
	for (var entry in classesByFile.entries)
	GeneratedFile(entry.key.path, (pkgRoot) async {
	var codeGenerator = _AnalyzerErrorGenerator(
	entry.key,
	entry.value,
	generatedCodes,
	);
	codeGenerator.generate();
	return codeGenerator.out.toString();
	}),
	GeneratedFile('analyzer/lib/src/diagnostic/diagnostic_code_values.g.dart', (
	pkgRoot,
	) async {
	var codeGenerator = _DiagnosticCodeValuesGenerator(generatedCodes);
	codeGenerator.generate();
	return codeGenerator.out.toString();
	}),
	];
	}

	/// Code generator for analyzer error classes.
	class _AnalyzerErrorGenerator {
	final GeneratedErrorCodeFile file;

	final List<ErrorClassInfo> errorClasses;

	final List<(String, String)> generatedCodes;

	final StringBuffer out = StringBuffer('''
	// Copyright (c) 2021, the Dart project authors. Please see the AUTHORS file
	// for details. All rights reserved. Use of this source code is governed by a
	// BSD-style license that can be found in the LICENSE file.

	// THIS FILE IS GENERATED. DO NOT EDIT.
	//
	// Instead modify 'pkg/analyzer/messages.yaml' and run
	// 'dart run pkg/analyzer/tool/messages/generate.dart' to update.

	// While transitioning `HintCodes` to `WarningCodes`, we refer to deprecated
	// codes here.
	''');

	_AnalyzerErrorGenerator(this.file, this.errorClasses, this.generatedCodes);

	void generate() {
	out.writeln('// ignore_for_file: deprecated_member_use_from_same_package');
	if (file.shouldIgnorePreferSingleQuotes) {
	out.writeln('// ignore_for_file: prefer_single_quotes');
	}
	out.write('''
	//
	// Generated comments don't quite align with flutter style.
	// ignore_for_file: flutter_style_todos
	''');
	out.writeln();
	out.write('''
	part of ${json.encode(file.parentLibrary)};
	''');
	bool shouldGenerateFastaAnalyzerErrorCodes = false;
	for (var errorClass in errorClasses) {
	if (errorClass.includeCfeMessages) {
	shouldGenerateFastaAnalyzerErrorCodes = true;
	}
	}
	if (shouldGenerateFastaAnalyzerErrorCodes) {
	out.writeln();
	_generateFastaAnalyzerErrorCodeList();
	}
	for (var errorClass
	in errorClasses.toList()..sort((a, b) => a.name.compareTo(b.name))) {
	out.writeln();
	if (errorClass.comment.isNotEmpty) {
	errorClass.comment.trimRight().split('\n').forEach((line) {
	out.writeln('/// $line');
	});
	}
	out.write(
	'class ${errorClass.name} extends DiagnosticCodeWithExpectedTypes {',
	);
	var memberAccumulator = MemberAccumulator();
	var entries = [
	...analyzerMessages[errorClass.name]!.entries,
	if (errorClass.includeCfeMessages)
	...cfeToAnalyzerErrorCodeTables.analyzerCodeToInfo.entries,
	].where((error) => !error.value.isRemoved);
	for (var entry in entries) {
	var errorName = entry.key;
	var errorCodeInfo = entry.value;

	try {
	if (errorCodeInfo is! AliasErrorCodeInfo &&
	errorClass.includeInDiagnosticCodeValues) {
	generatedCodes.add((errorClass.name, errorName));
	}
	errorCodeInfo.toAnalyzerCode(
	errorClass,
	errorName,
	memberAccumulator: memberAccumulator,
	);
	} catch (e, st) {
	Error.throwWithStackTrace(
	'While processing ${errorClass.name}.$errorName: $e',
	st,
	);
	}
	}

	var constructor = StringBuffer();
	constructor.writeln(
	'/// Initialize a newly created error code to have the given '
	'[name].',
	);
	constructor.writeln(
	'const ${errorClass.name}(String name, String problemMessage, {',
	);
	constructor.writeln('super.correctionMessage,');
	constructor.writeln('super.hasPublishedDocs = false,');
	constructor.writeln('super.isUnresolvedIdentifier = false,');
	constructor.writeln('String? uniqueName,');
	constructor.writeln('required super.expectedTypes,');
	constructor.writeln('}) : super(');
	constructor.writeln('name: name,');
	constructor.writeln('problemMessage: problemMessage,');
	constructor.writeln(
	"uniqueName: '${errorClass.name}.\${uniqueName ?? name}',",
	);
	constructor.writeln(');');
	memberAccumulator.constructors[''] = constructor.toString();

	memberAccumulator.accessors['severity'] = '''
	@override
	DiagnosticSeverity get severity => ${errorClass.severityCode};
	''';
	memberAccumulator.accessors['type'] = '''
	@override
	DiagnosticType get type => ${errorClass.typeCode};
	''';

	memberAccumulator.writeTo(out);
	out.writeln('}');

	if (literateApiEnabled) {
	out.writeln();
	_outputDerivedClass(errorClass, withArguments: true);
	out.writeln();
	_outputDerivedClass(errorClass, withArguments: false);
	}
	}
	}

	void _generateFastaAnalyzerErrorCodeList() {
	out.writeln('final fastaAnalyzerErrorCodes = <DiagnosticCode?>[');
	for (var entry in cfeToAnalyzerErrorCodeTables.indexToInfo) {
	var name =
	cfeToAnalyzerErrorCodeTables.infoToAnalyzerCode[entry]?.toCamelCase();
	out.writeln('${name == null ? 'null' : 'ParserErrorCode.$name'},');
	}
	out.writeln('];');
	}

	void _outputDerivedClass(
	ErrorClassInfo errorClass, {
	required bool withArguments,
	}) {
	var className =
	withArguments
	? errorClass.templateName
	: errorClass.withoutArgumentsName;
	out.writeln('final class $className');
	if (withArguments) out.writeln('<T extends Function>');
	out.writeln(' extends ${errorClass.name}');
	if (!withArguments) out.writeln(' with DiagnosticWithoutArguments');
	out.writeln('{');
	if (withArguments) {
	out.writeln('final T withArguments;');
	out.writeln();
	}
	out.writeln(
	'/// Initialize a newly created error code to have the given '
	'[name].',
	);
	out.writeln('const $className(');
	out.writeln('super.name,');
	out.writeln('super.problemMessage, {');
	out.writeln('super.correctionMessage,');
	out.writeln('super.hasPublishedDocs = false,');
	out.writeln('super.isUnresolvedIdentifier = false,');
	out.writeln('super.uniqueName,');
	out.writeln('required super.expectedTypes,');
	if (withArguments) out.writeln('required this.withArguments,');
	out.writeln('});');
	out.writeln('}');
	}
	}

	class _DiagnosticCodeValuesGenerator {
	final List<(String, String)> generatedCodes;

	final StringBuffer out = StringBuffer('''
	// Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file
	// for details. All rights reserved. Use of this source code is governed by a
	// BSD-style license that can be found in the LICENSE file.

	// THIS FILE IS GENERATED. DO NOT EDIT.
	//
	// Instead modify 'pkg/analyzer/messages.yaml' and run
	// 'dart run pkg/analyzer/tool/messages/generate.dart' to update.

	// We allow some snake_case and SCREAMING_SNAKE_CASE identifiers in generated
	// code, as they match names declared in the source configuration files.
	// ignore_for_file: constant_identifier_names

	// While transitioning `HintCodes` to `WarningCodes`, we refer to deprecated
	// codes here.
	// ignore_for_file: deprecated_member_use_from_same_package
	''');

	_DiagnosticCodeValuesGenerator(this.generatedCodes);

	void generate() {
	generatedCodes.sortBy((x) => '${x.$1}.${x.$2}');

	out.writeln();
	out.writeln(r'''
	import 'package:_fe_analyzer_shared/src/base/analyzer_public_api.dart';
	import 'package:_fe_analyzer_shared/src/base/errors.dart';
	import 'package:analyzer/src/dart/error/ffi_code.dart';
	import 'package:analyzer/src/dart/error/syntactic_errors.dart';
	import 'package:analyzer/src/error/codes.dart';
	import 'package:analyzer/src/manifest/manifest_warning_code.dart';
	import 'package:analyzer/src/pubspec/pubspec_warning_code.dart';
	''');
	out.writeln();
	out.writeln(
	"@AnalyzerPublicApi(message: 'exported by lib/error/error.dart')",
	);
	out.writeln('const List<DiagnosticCode> diagnosticCodeValues = [');
	for (var (className, errorName) in generatedCodes) {
	errorName = errorName.toCamelCase();
	out.writeln(' $className.$errorName,');
	}
	out.writeln('];');
	out.writeln();
	out.writeln(
	"@AnalyzerPublicApi(message: 'exported by lib/error/error.dart')",
	);
	out.writeln('@Deprecated("Use \'diagnosticCodeValues\' instead")');
	out.writeln(
	'List<DiagnosticCode> get errorCodeValues => diagnosticCodeValues;',
	);
	}
	}

	class _SyntacticErrorGenerator {
	final String errorConverterSource;
	final String parserSource;

	factory _SyntacticErrorGenerator() {
	String frontEndSharedPkgPath = normalize(
	join(pkg_root.packageRoot, '_fe_analyzer_shared'),
	);

	String errorConverterSource =
	File(
	join(
	analyzerPkgPath,
	joinAll(posix.split('lib/src/fasta/error_converter.dart')),
	),
	).readAsStringSync();
	String parserSource =
	File(
	join(
	frontEndSharedPkgPath,
	joinAll(posix.split('lib/src/parser/parser.dart')),
	),
	).readAsStringSync();

	return _SyntacticErrorGenerator._(errorConverterSource, parserSource);
	}

	_SyntacticErrorGenerator._(this.errorConverterSource, this.parserSource);

	void checkForManualChanges() {
	// Check for ParserErrorCodes that could be removed from
	// error_converter.dart now that those ParserErrorCodes are auto generated.
	int converterCount = 0;
	for (var errorCode
	in cfeToAnalyzerErrorCodeTables.infoToAnalyzerCode.values) {
	if (errorConverterSource.contains('"$errorCode"')) {
	if (converterCount == 0) {
	print('');
	print(
	'The following ParserErrorCodes could be removed'
	' from error_converter.dart:',
	);
	}
	print(' $errorCode');
	++converterCount;
	}
	}
	if (converterCount > 3) {
	print(' $converterCount total');
	}

	// Fail if there are manual changes to be made, but do so
	// in a fire and forget manner so that the files are still generated.
	if (converterCount > 0) {
	print('');
	throw 'Error: missing manual code changes';
	}
	}

	void printSummary() {
	// Build a map of error message to ParserErrorCode
	var messageToName = <String, String>{};
	for (var entry in analyzerMessages['ParserErrorCode']!.entries) {
	String message = entry.value.problemMessage.replaceAll(
	placeholderPattern,
	'',
	);
	messageToName[message] = entry.key;
	}

	String messageFromEntryTemplate(ErrorCodeInfo entry) {
	String problemMessage = entry.problemMessage;
	String message = problemMessage.replaceAll(RegExp(r'#\w+'), '');
	return message;
	}

	// Remove entries that have already been translated
	for (ErrorCodeInfo entry
	in cfeToAnalyzerErrorCodeTables.infoToAnalyzerCode.keys) {
	messageToName.remove(messageFromEntryTemplate(entry));
	}

	// Print the # of autogenerated ParserErrorCodes.
	print(
	'${messageToName.length} of '
	'${cfeToAnalyzerErrorCodeTables.infoToAnalyzerCode.length} ParserErrorCodes generated.',
	);

	// List the ParserErrorCodes that could easily be auto generated
	// but have not been already.
	var analyzerToFasta = <String, List<String>>{};
	frontEndMessages.forEach((fastaName, entry) {
	var analyzerName = messageToName[messageFromEntryTemplate(entry)];
	if (analyzerName != null) {
	analyzerToFasta
	.putIfAbsent(analyzerName, () => <String>[])
	.add(fastaName);
	}
	});
	if (analyzerToFasta.isNotEmpty) {
	print('');
	print('The following ParserErrorCodes could be auto generated:');
	for (String analyzerName in analyzerToFasta.keys.toList()..sort()) {
	List<String> fastaNames = analyzerToFasta[analyzerName]!;
	if (fastaNames.length == 1) {
	print(' $analyzerName = ${fastaNames.first}');
	} else {
	print(' $analyzerName = $fastaNames');
	}
	}
	if (analyzerToFasta.length > 3) {
	print(' ${analyzerToFasta.length} total');
	}
	}
	}
	}